640312062635 has 12 divisors (see below), whose sum is σ = 893823369408. Its totient is φ = 439071128496.

The previous prime is 640312062623. The next prime is 640312062653. The reversal of 640312062635 is 536260213046.

It is a happy number.

It is not a de Polignac number, because 640312062635 - 2¹² = 640312058539 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1306759067 + ... + 1306759556.

It is an arithmetic number, because the mean of its divisors is an integer number (74485280784).

Almost surely, 2^640312062635 is an apocalyptic number.

640312062635 is a deficient number, since it is larger than the sum of its proper divisors (253511306773).

640312062635 is a wasteful number, since it uses less digits than its factorization.

640312062635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613518642 (or 2613518635 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 640312062635 in words is "six hundred forty billion, three hundred twelve million, sixty-two thousand, six hundred thirty-five".